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Other comprehensive income (loss) (Tables) | 12 Months Ended
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Dec. 31, 2018
Table Text Block |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Changes in Accumulated Other Comprehensive Loss by Component [1]
|  |  |  | Years ended December 31,
(In thousands) |  |  | 2018 |  | 2017 |  | 2016
Foreign currency translation | Beginning Balance | $ | (43,034) | $ | (39,956) | $ | (35,930)
|  | Other comprehensive loss |  | (6,902) |  | (3,078) |  | (4,026)
|  | Net change |  | (6,902) |  | (3,078) |  | (4,026)
|  | Ending balance | $ | (49,936) | $ | (43,034) | $ | (39,956)
Adjustment of pension and |  |  |  |  |  |  |  |
| postretirement benefit plans | Beginning Balance | $ | (205,408) | $ | (211,610) | $ | (211,276)
|  | Other comprehensive loss before |  |  |  |  |  |
|  |  | reclassifications |  | (9,453) |  | (5,164) |  | (11,402)
|  | Amounts reclassified from accumulated other |  |  |  |  |  |
|  |  | comprehensive loss for amortization |  |  |  |  |  |
|  |  | of net losses |  | 13,141 |  | 13,684 |  | 13,386
|  | Amounts reclassified from accumulated other |  |  |  |  |  |
|  |  | comprehensive loss for amortization |  |  |  |  |  |
|  |  | of prior service credit |  | (2,116) |  | (2,318) |  | (2,318)
|  | Net change |  | 1,572 |  | 6,202 |  | (334)
|  | Ending balance | $ | (203,836) | $ | (205,408) | $ | (211,610)
Unrealized net holding |  |  |  |  |  |  |
| losses on debt securities | Beginning Balance | $ | (102,775) | $ | (69,003) | $ | (10,182)
|  | Other comprehensive loss before reclassifications |  | (71,036) |  | (40,446) |  | (58,958)
|  | Other-than-temporary impairment amounts reclassified |  |  |  |  |  |
|  |  | from accumulated other comprehensive loss |  | - |  | 6,740 |  | 167
|  | Amounts reclassified from accumulated other |  |  |  |  |  |
|  |  | comprehensive loss for gains on securities |  | - |  | (66) |  | (30)
|  | Net change |  | (71,036) |  | (33,772) |  | (58,821)
|  | Ending balance | $ | (173,811) | $ | (102,775) | $ | (69,003)
Unrealized net holding |  |  |  |  |  |  |
| gains on equity securities | Beginning Balance | $ | 605 | $ | 685 | $ | 622
|  | Reclassification to retained earnings due to cumulative |  |  |  |  |  |
|  |  | effect adjustment of accounting change |  | (605) |  | - |  | -
|  | Other comprehensive income before reclassifications |  | - |  | 121 |  | 373
|  | Amounts reclassified from accumulated other |  |  |  |  |  |
|  |  | comprehensive income for gains on securities |  | - |  | (201) |  | (310)
|  | Net change |  | (605) |  | (80) |  | 63
|  | Ending balance | $ | - | $ | 605 | $ | 685
Unrealized net losses |  |  |  |  |  |  |
| on cash flow hedges | Beginning Balance | $ | (40) | $ | (402) | $ | (120)
|  | Other comprehensive income (loss) before |  |  |  |  |  |
|  |  | reclassifications |  | 326 |  | (790) |  | (2,203)
|  | Amounts reclassified from accumulated other |  |  |  |  |  |
|  |  | comprehensive loss |  | (677) |  | 1,152 |  | 1,921
|  | Net change |  | (351) |  | 362 |  | (282)
|  | Ending balance | $ | (391) | $ | (40) | $ | (402)
|  | Total | $ | (427,974) | $ | (350,652) | $ | (320,286)
[1] All amounts presented are net of tax. |  |  |  |  |  |
Reclassification Out Of Accumulated Other Comprehensive Income [Table Text Block] |
|  | Reclassifications Out of Accumulated Other Comprehensive Loss
|  | Affected Line Item in the | Years ended December 31,
(In thousands) | Consolidated Statements of Operations | 2018 | 2017 | 2016
Adjustment of pension and postretirement benefit plans |  |  |  |  |  |  |
| Amortization of net losses | Personnel costs | $ | (21,542) | $ | (22,428) | $ | (21,948)
| Amortization of prior service credit | Personnel costs |  | 3,470 |  | 3,800 |  | 3,800
|  | Total before tax |  | (18,072) |  | (18,628) |  | (18,148)
|  | Income tax benefit |  | 7,047 |  | 7,262 |  | 7,080
|  | Total net of tax | $ | (11,025) | $ | (11,366) | $ | (11,068)
Unrealized holding losses on debt securities |  |  |  |  |  |  |
| Realized gain on sale of debt securities | Net gain on sale and valuation adjustments |  |  |  |  |  |
|  |  | of investment securities | $ | - | $ | 83 | $ | 38
|  | Other-than-temporary impairment losses |  |  |  |  |  |
|  |  | on available-for-sale debt securities |  | - |  | (8,299) |  | (209)
|  | Total before tax |  | - |  | (8,216) |  | (171)
|  | Income tax benefit |  | - |  | 1,542 |  | 34
|  | Total net of tax | $ | - | $ | (6,674) | $ | (137)
Unrealized holding gains on equity securities |  |  |  |  |  |  |
| Realized gain on sale of equity securities | Net gain on sale and valuation adjustments |  |  |  |  |  |
|  |  | of investment securities | $ | - | $ | 251 | $ | 341
|  | Total before tax |  | - |  | 251 |  | 341
|  | Income tax expense |  | - |  | (50) |  | (31)
|  | Total net of tax | $ | - | $ | 201 | $ | 310
Unrealized net losses on cash flow hedges |  |  |  |  |  |  |
| Forward contracts | Mortgage banking activities | $ | 1,110 | $ | (1,888) | $ | (3,149)
|  | Total before tax |  | 1,110 |  | (1,888) |  | (3,149)
|  | Income tax (expense) benefit |  | (433) |  | 736 |  | 1,228
|  | Total net of tax | $ | 677 | $ | (1,152) | $ | (1,921)
|  | Total reclassification adjustments, net of tax | $ | (10,348) | $ | (18,991) | $ | (12,816)

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